#define _CRT_SECURE_NO_WARNINGS 1

#include<stdio.h>

struct ListNode {
    int val;
    struct ListNode *next;
    ListNode(int x) : val(x), next(NULL) {}
};
class PalindromeList {
public:
    struct ListNode* middleNode(struct ListNode* head)
    {
        struct ListNode* fast = head, * slow = head;
        while (fast && fast->next)
        {
            fast = fast->next->next;
            slow = slow->next;
        }
        return slow;
    }
    struct ListNode* reverseList(struct ListNode* head)
    {
        struct ListNode* cur = head;
        struct ListNode* newhead = NULL;
        while (cur)
        {
            struct ListNode* next = cur->next;
            cur->next = newhead;
            newhead = cur;
            cur = next;
        }
        return newhead;
    }
    bool chkPalindrome(ListNode* A)
    {
        struct ListNode* mid = middleNode(A);
        struct ListNode* rmid = reverseList(mid);
        while (rmid && A)
        {
            if (rmid->val != A->val)
                return false;
            rmid = rmid->next;
            A = A->next;
        }
        return true;
    }
};